There are similar threads regarding this on the site, but mine seems to be a unique case... My external drive has been used once. It was formatted, partitioned and files were saved on a mac. It showed up on a friends computer running Linux, and it showed up on my PC at home, but it hasn't been turned on since (about two weeks). This is where the problems begin. A few days ago I purchased a new enclosure for my HD (Nexstar 3.5). I took the HD out of it's old enclosure and put it in the new one (I needed the new enclosure for school purposes). I got to school today and plugged it in to the mac, but the drive didn't show up on the desktop. I tried to connect with Firewire 400, 800 and USB 2.0 but no luck with any of them (a USB key worked fine). Just to make sure it was working, I got home plugged it in to my PC and it showed up instantly. From looking at other threads regarding this issue they all say I have to access the Utility menu. The only problem is since the mac I need to use is a school computer I can't access the Utility menu. It says I don't have authorization to use that menu, and won't allow me to go any further. I don't know what to do from here. I can't reformat the drive because there is rather important info on there that hasn't been backed up yet. What can I do? Thanks for any help you can offer!!